66171227 has 2 divisors, whose sum is σ = 66171228. Its totient is φ = 66171226.

The previous prime is 66171221. The next prime is 66171241. The reversal of 66171227 is 72217166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66171227 - 2¹⁴ = 66154843 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66171193 and 66171202.

It is not a weakly prime, because it can be changed into another prime (66171221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33085613 + 33085614.

It is an arithmetic number, because the mean of its divisors is an integer number (33085614).

Almost surely, 2^66171227 is an apocalyptic number.

66171227 is a deficient number, since it is larger than the sum of its proper divisors (1).

66171227 is an equidigital number, since it uses as much as digits as its factorization.

66171227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 66171227 is about 8134.5698718494. The cubic root of 66171227 is about 404.4731797707.

The spelling of 66171227 in words is "sixty-six million, one hundred seventy-one thousand, two hundred twenty-seven".